Microwave bentonite silylation for dye removal: Influence of the solvent

Queiroga, Líbia N.F.; Pereira, Micaela Benigna; Silva, Lucinaldo S.; Filho, Edson Cavalcanti da Silva; Santos, I. M. G.; Fonseca, Maria G.; Georgelin, Thomas; Jaber, Maguy

doi:10.1016/j.clay.2018.11.027

Cited by 29 publications

(8 citation statements)

References 60 publications

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“…Secondly, the nanoparticles of niobium were silanized with the (3-mercaptopropyl) trimethoxysilane (MPTMS) silylating agent by a silanization reaction based on the methodology by Queiroga, et al 23 (2019) applied to bentonites. The acid was previously dried in a 100-°C oven for 24 hours.…”

Section: Methodsmentioning

confidence: 99%

Niobium oxyhydroxide as a bioactive agent and reinforcement to a high-viscosity bulk-fill resin composite

OBEID,

NASCIMENTO,

AGASSI

et al. 2024

J. Appl. Oral Sci.

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Objective The present in vitro study incorporated niobium oxyhydroxide fillers into an experimental high-viscosity bulk-fill resin composite to improve its mechanical performance and provide it a bioactive potential. Methodology Scanning electron microscopy synthesized and characterized 0.5% niobium oxyhydroxide fillers, demonstrating a homogeneous morphology that represented a reinforcement for the feature. Fillers were weighed, gradually added to the experimental resin composite, and homogenized for one minute, forming three groups: BF (experimental high-viscosity bulk-fill resin composite; control), BF0.5 (experimental high-viscosity bulk-fill resin composite modified with 0.5% niobium oxyhydroxide fillers), and BFC (commercial bulk-fill resin composite Beautifil Bulk U, Shofu; positive control). In total, 10 specimens/groups (8 × 2 × 2 mm) underwent flexural strength (FS) tests in a universal testing machine (Instron) (500N). Resin composites were also assessed for Knoop hardness (KH), depth of cure (DoC), degree of conversion (DC), elastic modulus (E), and degree of color change (ΔE). The bioactive potential of the developed resin composite was evaluated after immersing the specimens into a simulated body fluid in vitro solution and assessing them using a Fourier-transformed infrared spectroscope with an attenuated total reflectance accessory. One-way ANOVA, followed by the Tukey’s test (p<0.05), determined FS, DC, KH, and ΔE. For DoC, ANOVA was performed, which demonstrated no significant difference between groups (p<0.05). Conclusions The high-viscosity bulk-fill resin composite with 0.5% niobium oxyhydroxide fillers showed promising outcomes as reinforcement agents and performed well for bioactive potential, although less predictable than the commercial resin composite with Giomer technology.

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Section: Methodsmentioning

confidence: 99%

Niobium oxyhydroxide as a bioactive agent and reinforcement to a high-viscosity bulk-fill resin composite

OBEID,

NASCIMENTO,

AGASSI

et al. 2024

J. Appl. Oral Sci.

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“…The effect of pH on dye adsorption was studied at pH 1, 3, 5, 7, 9, and 11, where the pH was adjusted with NaOH and HCl solutions. Maintaining the concentration of 300.00 mg•L −1 of the dye, the study was carried out in triplicate at 25 • C [25,27]. The 100.00 mg samples of biomaterials were placed in contact with 20 mL of MB 300.00 mol•L −1 solution.…”

Section: Influence Of Phmentioning

confidence: 99%

Application of Water Hyacinth Biomass (Eichhornia crassipes) as an Adsorbent for Methylene Blue Dye from Aqueous Medium: Kinetic and Isothermal Study

Carneiro

Barros²,

Morais³

et al. 2022

Polymers

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Water pollution has generated the need to develop technologies to remove industrial pollutants. Adsorption has been recognized as one of the most effective techniques for effluent remediation. In this study, parts (stem and leaves) of a problematic aquatic weed, the water hyacinth (Eichhornia crassipes), were separated to produce a bioadsorbent. The objective was to evaluate the adsorption of a cationic dye, methylene blue (MB), in an aqueous solution of the biomass from different parts of the water hyacinth (Eichhornia crassipes) plants. The materials were characterized through techniques of infrared spectroscopy, scanning electron microscopy, X-ray diffractometry, and thermogravimetric analysis, before and after the material adsorption. Water hyacinth biomasses presented adsorption capacity above 89%, and the kinetics was faster for stem biomass. The kinetic study found that the adsorption process is better described by the pseudo-second-order model, and the adjustments of the isotherm experimental data indicated that both materials are favorable for adsorption. Therefore, water hyacinth bioadsorbent represents a renewable resource with potential for effluent treatment.

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“…Therefore, some modifications have been proposed to overcome these limitations [23,24]. The main clay modifications reported in the literature are ion exchange [25], intercalation of cationic surfactants [26], pillaring with different metal oxides [27], silylation [28], coating of hexadecyltrimethoxysilane (HDTMS) and tetraethoxysilane (TEOS) [29].…”

Section: Introductionmentioning

confidence: 99%